Aquatic Cavalry

Conjuration (Summoning)
Level: Antipaladin* 2, Druid * 2, Hunter * 2, Paladin * 2, Ranger * 2, Shaman * 2, Summoner * 2
Components: V, S, DF
Casting Time: 1 round
Range: medium (100 ft. + 10 ft./level)
Effect: 1 hippocampus plus 1 hippocampus/3 caster levels
Duration: 1 hour/level (D)
Saving Throw: None
Spell Resistance: no
  You summon a school of hippocampi (one plus one per 3 Caster Levels, to a maximum of six at 15th level; Pathfinder RPG Bestiary 2 155) to serve as combat-trained mounts. The hippocampi avoid combat if possible but defend themselves if attacked. If any hippocampus attacks, the remaining duration of the spell changes from 1 hour per level to 1 round per level (so if a full 4 hours remained, the hippocampi last for only 4 more rounds).